The collision occurred about 15 minutes after the ferry departed in the Macao Outer Harbor, China's official Xinhua news agency reported.
The ship - which was carrying 175 passengers and eight crew members -- returned to dock after the collision.
Of the 27 passengers who were injured, 25 were transported to a hospital, mostly for treatment of bruises and scratches, police said.
LGBT community has 'bullied the American people': Bachmann
Beautician charged with giving client fatal silicone butt injection